Method and apparatus for pulse position modulation
AssigneeDSP Group Ltd.
InventorIsrael Greiss
Life of this patent
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Abstract
A method for reducing the transition rate of a pulse width modulated signal representing an original signal having a predetermined frequency range of interest and producing an output signal, the method including the steps of: combining pulses from a predetermined number of consecutive frames into a combined pulse; and positioning the combined pulse within the predetermined number of consecutive frames, such that the output signal has substantially the same Fourier Transform phase as the pulse width modulated signal, for at least the predetermined frequency range of interest of the original signal.
Claims12
A method for reducing the transition rate of a pulse width modulated signal representing an original signal having a predetermined frequency range of interest and producing an output signal, the method comprising the steps of:
- combining pulses from a predetermined number of consecutive frames into a combined pulse;
- and
- positioning the combined pulse within the predetermined number of consecutive frames, such that the output signal has substantially the same Fourier Transform phase as the pulse width modulated signal, for at least the predetermined frequency range of interest of the original signal.
A method for reducing jitter distortion from a pulse width modulated signal representing an original signal having a predetermined frequency range of interest and producing an output signal, the method comprising the steps of:
- combining a first group of pulses from a first group of predetermined number of consecutive frames into an odd combined pulse;
- combining a second group of pulses from a second group of predetermined number of consecutive frames into an even combined pulse;
- and
- positioning the odd combined pulse so that the odd combined pulse ends at the end of the first group of predetermined number of frames, and positioning the even combined pulse so that the even combined pulse starts at the beginning of the second group of predetermined number of frames.
Dependencies are inferred from the claim text.